add airspy support (untested for now)

config_webrx.py

@@ -93,7 +93,7 @@ Note: if you experience audio underruns while CPU usage is 100%, you can:
 # Check here: https://github.com/simonyiszk/openwebrx/wiki#guides-for-receiver-hardware-support #
 #################################################################################################
 
-# Currently supported types of sdr receivers: "rtl_sdr", "sdrplay", "hackrf"
+# Currently supported types of sdr receivers: "rtl_sdr", "sdrplay", "hackrf", "airspy"
 
 sdrs = {
     "rtlsdr": {

owrx/feature.py

@@ -12,7 +12,8 @@ class FeatureDetector(object):
         "core": [ "csdr", "nmux" ],
         "rtl_sdr": [ "rtl_sdr" ],
         "sdrplay": [ "rx_tools" ],
-        "hackrf": [ "hackrf_transfer" ]
+        "hackrf": [ "hackrf_transfer" ],
+        "airspy": [ "airspy_rx" ]
     }
 
     def is_available(self, feature):
@@ -63,3 +64,6 @@ class FeatureDetector(object):
         # TODO i don't have a hackrf, so somebody doublecheck this.
         # TODO also check if it has the stdout feature
         return os.system("hackrf_transfer --help 2> /dev/null") != 32512
+
+    def has_airspy_rx(self):
+        return os.system("airspy_rx --help 2> /dev/null") != 32512

owrx/source.py

@@ -130,6 +130,7 @@ class SdrSource(object):
         start_sdr_command = self.command.format(
             samp_rate = props["samp_rate"],
             center_freq = props["center_freq"],
+            center_freq_mhz = props["center_freq"]/1e6,
             ppm = props["ppm"],
             rf_gain = props["rf_gain"],
             lna_gain = props["lna_gain"],
@@ -249,6 +250,12 @@ class SdrplaySource(SdrSource):
     def sleepOnRestart(self):
         time.sleep(1)
 
+class AirspySource(SdrSource):
+    def __init__(self, props, port):
+        super().__init__(props, port)
+        self.command = "airspy_rx -f{center_freq_mhz} -r /dev/stdout -a{samp_rate} -g {rf_gain}"
+        self.format_conversion = "csdr convert_s16_f"
+
 class SpectrumThread(threading.Thread):
     def __init__(self, sdrSource):
         self.doRun = True